H - Electricity – 05 – G
Patent
H - Electricity
05
G
358/34, 358/11.1
H05G 1/00 (2006.01) A61B 6/03 (2006.01) G01T 1/29 (2006.01) G06T 11/00 (2006.01)
Patent
CA 1051128
Application fox Patent of Douglas P. Boyd for POSITION SENSITIVE X-RAY OR .gamma.-RAY DETECTOR AND 3-D TOMOGRAPHY USING SAME ABSTRACT OF THE DISCLOSURE A fan-shaped beam of penetrating radiation, such as X-ray or .gamma.-radiation, is directed through a slice of the body to be analyzed to a position sensitive detector for deriving a shadow- graph of transmission or absorption of the penetrating radiation by the body. A number of such shadowgraphs are obtained for different angles of rotation of the fan-shaped beam relative to the center of the slice being analyzed. The detected fan beam shadowgraph data is reordered into shadowgraph data correspond ing to sets of parallel paths of radiation through the body. The reordered parallel path shadowgraph data is then convoluted in accordance with a 3-D reconstruction method by convolution in a computer to derive a 3-D reconstructed tomograph of the body under analysis. In a preferred embodiment, the position sensitive detector comprises a multiwire detector wherein the wires are arrayed parallel to the direction of the divergent penetrating rays to be detected. A focused grid collimator interposed between the body and the position sensitive detector for collimating the penetrating ray to be detected. The source of penetrating radiation is preferably a monochromatic source.
240689
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